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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38339146dd088f9cafb1292e62a5f55334a0f3b8b3b941d4dacb4a2f959acee8' 
  AND token = 'yIHe2iss3OQNKe9lk9IHR/dZFpU9oTHBREJuN60O3bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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