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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5261c6100fe9af08154dbe4ebc8bd984517a07b52434a0f04b93812fd500e5e' 
  AND token = 'AptaopK8MchT64cvU3ft5Wh8VO4Q19sNJt/5UanEpIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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