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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136f1766eae3dd6f94f2b4077d16a7cb6019a936de0443dadc12f6794a6adc37' 
  AND token = '+eGuETGP7tBplbgYMvcE4ZTIDRiBVts+vtksfiJb9g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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