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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe886aa641c4cda99dbd716265316444e65de7f2af700ec134892fe8c69d102a' 
  AND token = '0Z7dY8/0oFfWsrYLl/mKgL0sXH2TY3k2ocuaJBX9uNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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