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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94b200278fe3c0c1312bf93718564b41a18961878d60cbbf6f1d03c7966d7c1' 
  AND token = '3Lrak7Vpv211tpC+J8vs04WoY2sqFt1Lx7gTvkawTZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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