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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5d201716ff9f8d6920948d6a6aa0993c9b23d656c866db642be4aefb651616' 
  AND token = 'KbK0pHXnFdoX64V65lP4QRN41b+SgFZftTJbkLVugFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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