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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85d55f094337c7412951c70c5c34c99d631844697f3ea8448c56cda88caa7e1' 
  AND token = 'PSmbLJqxu/zTw/Ssi6p7ep73YeWBffPooMeForugC2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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