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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37db708ed8679a06a1eb425154a1b58ea9f9e9abca65a4959be44a82aa26d4c' 
  AND token = 'MbSM1PhJGqYmVxvv0GI4Vxa0E9gCNw4lqLA4BIGDGYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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