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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070af42a5c5ccfb3bd6eaaa3650688c8427cc032433d73fd9a9cf7c0ab723b66' 
  AND token = '5HnGtZaU9cGBkGCXgWjdvg40qVSjbTl7z7q7zXIv11I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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