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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c057aba98b85d8d9a6b5cdb52a95cc87af46e8aa1bbe07bc2e030cd1e8099fd5' 
  AND token = 'LpOF9Ugr8ZRHsFLEnDQi+gnsQjEkRUHdRe6b6L8TjNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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