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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b71d922898472ecceb5ed3c1078f089ef13cfed664f7df3f4c572127ee06cf' 
  AND token = 'ZyRStitcfOvwXmHVB9LU87sGRzAMELPOkaKh+i1w+Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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