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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84516e2fe12770011103777cd7fb8e4525bbb00c06ac19c8cc09635d76fd4ad' 
  AND token = 'AY/987NXEydalYZHG9NuF5BygCsGL8q0uof1etpKtFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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