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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd822a0d1016fca762ca115f5aee980fddc58a7c0b29c023b8b31119987b00d4' 
  AND token = '9fPl7hOPgqlbnPnMnXrjVeYD8JRXUgOkMgZDgJLx6dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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