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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa26035cad4dc45cea20bb4efe06ce2415a1f79d560781d3bc57eff6d2a7928' 
  AND token = 'LeG4gy34CGo9SdkTZmgZkDjd4n4dK6uhUFYWS8Wfxic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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