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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a8bca6f598d413f3efce2e99ddc4d5e07a72b6817f7ec5193a83d2a38413f4' 
  AND token = 'bX2ckBcWVB0zqO51xjBBolLJvKxwfl92x2fCUrv95Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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