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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5625ad29fd2f817868602ae4a03681d036cca85959541385918ad222624a00a' 
  AND token = '3lQZzVujBi8BRxJMyacvMbQ4yBpsG5P4htVfEd45kNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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