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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0a5a85938a5c2859988f850534d18f41e157b77a3829717fdaaa142c786311' 
  AND token = 'ZYGeFKHluA+evXo5uaojSNVqHFXMg1b6LbD9p7OHJSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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