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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79794ffec6e40a6afd3afd08c8ade832feb3eefc206fd42ff8bd49c95123a9d3' 
  AND token = 'jIelNxiM9heQb7Lg9mSIV7hPy7gwk6hb2VvAo0d9+vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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