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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab9325285bb185f21858842d43c523bab85707b267603b196fd468f79e36abf' 
  AND token = '1RhXB1hqbfvd6E3M64XL4XOnbVbrJwJFbeQA9Td6GTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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