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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2882105c546873dd73764ed6eeb92864cd21a31935e5022137bc9124aa484d1' 
  AND token = 'Sv/v1o8FVqFpRWOQjjAqEjN65X94usNyuAhI5RHOX0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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