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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13be18a4cb6d6d277c7794d9602ce74a1a7b805eac28f098a654a3fbb3dae8b' 
  AND token = 'BMe5kTRT1hV4ppbJnipty0+NSICUvRl5PzC9FgZQxh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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