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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8da19d7d83b16a7082debb1ade9db961dd52396c8e7de2f00125b53e5d60c71' 
  AND token = 'RKDyasptxh3VihAG0uQqZTY7UknWLRhfSdfCnnjjevc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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