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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c350dc4e535dc3104f0e4739aae157b07d1c79d272cc26d108cb8fc887cda27' 
  AND token = 'hALuHAWIIQgrrv34niPpZj9Z3LbtN9Q2EFDp8rwinVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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