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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1027abb73f06caf1dc8ccf611d9fde82af1dbd8926817d52d808717cf8ecfc8d' 
  AND token = 'lE0U+8ouc6USfSz+1wwn5vNq6i2i6865gOuRnxAXh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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