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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faea2458ecfd5280cfd83a868e1aa35a539bf006ff8c93bb3fd8dd6c3ab2e56c' 
  AND token = 'KYs0dimbnuPKmjcCvCDZf3quj55d7HQ2n8gZtEDlKxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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