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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350cd39d1918a3d1748f24d31e12cc6294fd19fca54e0df214cec0d39dfcf2cc' 
  AND token = 'qr9pCbMbGtNy7xN7PxGmAHON4UEqPkKNddxgjsKaZK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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