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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba8a25e1cb471086963d19f85320609678bb44ba6c8559046ca70a7f018c075' 
  AND token = 'aULo3Tfx93MpXtduQA1h5pYrwW1j/HC0PM/CoJrUaig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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