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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0ba2c15293addb58462bb24b899c65368f77f7c928d5d871305ad9c3e3362f' 
  AND token = 'vLioWpTeFAWNxBq5saCBTgWKfFOL/cBCKeFB8ylKuQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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