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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '646d4d08784d42203c8b2e1d3f5709f4fa292b6c7481d7c609a6ef650c61a5c6' 
  AND token = 'Bzw8gj0J9cTpanRC3p0nZQ1asvtNbGlJn/WprMarx3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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