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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471675e3f37de46be2e7d0efd754529c26b19c4fcf1364ecef7a89c4f28892b7' 
  AND token = '0OGZDFHUF2l5w6Op3vKMC0C6VO5ta4ckKPLXsMc9i+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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