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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb453c55803b72186f3306366e62c72bf434acf443e1bb35aa5412d8e8d5c98c' 
  AND token = 'A1bP8hoYsCWKCahAJDiR5tyQnzMhnXZqeCXwfcKWEbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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