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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4312a603600a160d44d6ea9a26687e5f092ae7be3fabc966dbb12bbbf23c9b2a' 
  AND token = 'aujINl1e2vj4Rul0TWI2dM8oGYONcslHHUj/J7eJVro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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