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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267b5181b9207216f217e92c7fc308a7cf185c3f4572b3439157d14fdad8d6c8' 
  AND token = 'c/qLWS5m42LkZZJUt7ImxiXvQmFX+kRNpE26Nz0IoGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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