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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d873ae5c6840affb4e981c578eea0ca9e6592a7cb1137a3df1f09dbd9b085dc' 
  AND token = 'OfNsoUcfbDJSrlSGxMhp/KKdrUl4xQjx9rpQ+rQItMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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