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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6270879f18ffcad67c8e14b6418772f30c9a9aafd00b90c1f4aff59b0e95df2' 
  AND token = 'TYAmE+BGhi7B0fjnqcZ5f4s+k64WdOYyuGsVQSifYFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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