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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9898350b5a2ac6204ec09dd8532b52a2c2c1de67c5c16530c1c5fe25e5d905a' 
  AND token = 'RPbRfkuZrpO9kOpIHTTyCLyxP/hNqurGNO5CdZD3INo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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