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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaef284cb7334e207ee3b56dfd071102d141a21a9d7a773a724af5ddd714318e' 
  AND token = 'FZosEELz7N/h6fp0p4vKSUhmlLPfRv9YISttJSXX/CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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