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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dae872b390f1310cffeef584b5ade642014c6105fee10c261539c656954e73' 
  AND token = 'emNZjHQ8m72GRU2Y+VImJEzjSWN8vOCai74DSnolSyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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