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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6704fe1e94e49e4c40a3122d41fea41f6affdfd64dc8c63672c2173511700656' 
  AND token = 'BPv40J2GnVkbQ5HdwliM4kZmeu2G1kU5P87NBZV2d8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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