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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2531836f5b4625a6907914d04ea59b15d9b98d951afec1e4f8406c8513b3ea36' 
  AND token = '0+9/fQgswfHl5EMhZ1L1eFOJmAfjRR5v61EbypbO+eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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