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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31ade949439325668dc21d09dce692c433ca27f62f111c0261ceead03e913da' 
  AND token = 'mal09KOLQ4oNW2QoSQJry9le+QtOoEkYVCHfq8Czqyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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