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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767c56a5bc2d44284b80534022c745f834d314db7800a5712d9c0e8883870eec' 
  AND token = 'VoUnmlS6G7uqSmP1Vc1yYR9/3pcbTZE+dmy9yMP8sa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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