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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e462a9f514c737cde6ddbf9be5881d0ef30d4ed43c9cc284a2e343c59a4991' 
  AND token = 'ZP0sPlzBV40tforVVCnUKepB9xgLKqF5IbzlHaoy96s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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