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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8ef04306bb1cd8154b3f33cfbe31ed45f9c054c024b00eb94c30eecd55cfe5' 
  AND token = 'Wbgv/v787VNRe3ohQlULsIc0R0804PqEfOPyTt11aYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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