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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a2603841afae2769d4788a7d04a9a993926b1f01ded0c39bc7600b23149faa' 
  AND token = 'bNNiT77MrYZop7bvFMc6AmvxKsJwAhntWGUf+/kK9/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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