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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5a4990b424f535d51133cc659d27901f69e4fa2d95ff40ffd41af65d6a883c' 
  AND token = 'w6h6e9G5lKxUwULeMn6Ru/3EjlSV5uv703QGVGYKnTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}