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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcd436a0c5799f06fd079a55ba9e4d2aa8e44c4d67f09cd80218fe8a474ffdb' 
  AND token = 'OmH0+sg6LOG7gScAvmR2T5Thzo2KMvYrIKGK18ABgkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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