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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31aa0f7261716acd888d1fc963b722cb34f0902fa7293d7fe4e4b9a3d3b630d' 
  AND token = 'DDJn5sRywtItx+ph17NcKohkY5YUC3kQTlVUxkbMank=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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