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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e884a858a99bec830f53a3d05c77cdd8fade8336fb2b82e2592ad58de8476ecc' 
  AND token = 'v0XWVeZ2yI1laELa94NT5k+h6eF71ny/gSdHpQNNRKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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