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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0a72a773c1ea06c35508bbc93dda0e58e7dec108424976c1833c87b08b6d74' 
  AND token = 'oLNJgmJ1CN9bLORGktwOTLL0swdKN2TqEHDKwK1NeN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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