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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479fa0592397eeb9fd424accbfac12cd21e0c1e09bab6f60ebb84a1bb7cf502f' 
  AND token = 'm3PMyivR+fwHaSEfPPtfVeJWIOnp+rPU6nhSdg1UQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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