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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c25d69ae41856f6d607d629475c0d5e0ff9a97a83d97c532f40cc481245a76' 
  AND token = 'znD2BVfE1MqYQKZEGx64KseFTdggDqi8f8DSa/68v08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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