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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eddbc6cfca69a973381abb7bbe4d3252e9211ad8e951a8706bbb03c9bcd5d84' 
  AND token = 'IO1KF8gP7iz4ZHFVHznDefEKRye9LUmkyWz/RZIKLbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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