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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8a81b5b427b6e660d0b718fdd4a816eb96dcad182d1d776b67e7b9dba82a4b' 
  AND token = 'VfH1NwzfV77Dd5obybLdgbr1VTxf4BpRsDRRikIzz8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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