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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d70528c8bddfec3f32cc24442c05f7bd2cf268c712ce9ef0349acd14042239' 
  AND token = 'rX9bVGWYS8q0D4dgpsEte6qXg4XLSOO/TJ9F8CaZ61A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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