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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42192bf7a91916545dc3e3a93c80820c6953d2f9c4913f8a95dbefd5c2e2694b' 
  AND token = 'A9HQWCQmCrTu60J82OnTjjl5+rMhsjzpBWYYWSSAc/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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